I don't see the war lasting long enough for significant new formations to be raised -- not while the US is trying to sustain high intensity operations on 3+ fronts.
All the stuff left by units that punched out for POMCUS sites wasn't bonus waiting for new guys to fall in on it, it would have been right into the pipeline for the equipment side of battle casualty replacements. And equipment losses on the European front by itself would be staggering compared to what we've seen in the '91 and '02 iterations redecorating the Cradle of Civilization. Likewise guys rolling through the initial training pipeline -- most would be individual replacements bound for units already in theater, not set aside for new units. The handful of new or rebuilt from the ground up units depicted in T2K are probably a reasonable estimation of what would be feasible while simultaneously keeping units in theater(s) combat effective.
The whole WW3 situation isn't a replay of World War Two -- the logistics of wartime production of everything from M1 tanks to aircraft to modern munitions is significantly more complicated and much more bottlenecked. You can't farm out Bradley or M1 production to the Saturn car plant in Tennessee and such as was routinely done in WW2 stuff -- and even if you could, the war goes nuclear in less than 12 months, which isn't enough time for much of that to happen at all even for stuff that has an easier cross over.
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